JPS62110448A - Synchronized speed controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to frequency control among synchronous control when paralleling a system of independently operating water turbine generators and a healthy operating line by remote control. It is.

[Technical background of the invention and its problems]

Newly constructed hydroelectric power plants in recent years are mostly unmanned power plants, and control and monitoring are carried out from control centers located far away.

In addition, when a power outage occurs in the entire system due to a system accident,
In order to speed up the recovery time, we started up a hydroelectric power plant from a distance due to the short start-up time and trial power transmission capacity.
There are many requests to conduct grid trial transmissions.

In particular, when restoring a large system, multiple hydroelectric power plants are used to perform trial transmission of the system in each area, and after the trial transmission is completed, other healthy systems and appropriate substations are installed after the trial transmission. The load/power is transmitted in parallel and synchronously to expand a healthy system.

FIG. 5 is a configuration diagram when implementing conventional synchronous control. 1 is an unmanned power plant, 2 is a water turbine, 3 is a generator, 4 is a main transformer, 5 is a parallel breaker, 6 is a speed governor control device, 7 is a speed adjustment setting device, 8 is a remote monitoring control device A slave station 9 is a power transmission line for transmitting power from the power plant 1.

Reference numeral 10 indicates a control station installed at a remote location to control and monitor the unmanned power plant 1; 11 indicates a master station of a remote monitoring and control device;
Reference numeral 2 denotes a transmission line for receiving and passing signals between the unmanned power plant 1 and the control center 10.

13 is a substation that can operate the system Vc9 connected to the unmanned power plant 1 in parallel with another system 14; 14 is a transmission line that can supply power from the unmanned power plant 1 and another power plant; 1
5 is a breaker for connecting system 9 and system 14, 16 is an instrument transformer for obtaining frequency information of system 9 or system #1lC14, and 17 is an automatic synchronizer for turning on the parallel circuit breaker 15. be.

A conventional system restoration operation method will be explained with reference to FIG. When a system accident occurs in a power transmission line 9 connected to an unmanned power plant 10 and the system is completely stopped, a system restoration operation is carried out after the accident is restored.

First, the control center 10 gives an operation command in the trial power transmission mode to the generator 3 of the unmanned power plant 1 which is capable of trial power transmission operation via the master station 11 of the remote monitoring and control device.

The operation command given from the control station 10 is received by the slave station 8 of the power plant 1 via the transmission line 12, and a start command is given to the water turbine 2. When the water turbine 2 rotates and reaches a speed near the rated speed, an excitation (not shown) is applied to the generator 3 to generate a voltage. Next, the parallel power supply 5 is turned on, and the power transmission line 9 and the generator are connected via the main transformer 4. Furthermore, while confirming the safety of the system, the voltage generated by the generator 3 is gradually increased until it reaches the rated voltage at the end of the system 9.

Once the safety of the system has been confirmed, the substation 1, which is generally far away from the unmanned power plant 1 or the control center 10, is installed to supply power to the loads that were connected to the transmission line 9 before the system i accident.
For system parallel connection with other healthy systems at 3, 1m vessel 15
The synchronizer 16 is used to input the . At this time, frequency adjustment is performed on the water turbine 2 that was performing the trial power transmission of the unmanned power plant 1 in order to match the frequencies of both systems. At the control station 10, the operator obtains the frequency information of the healthy system 140 by telephone, etc., compares it with the frequency of the system 9, which was undergoing accident recovery, and issues a lower command when the system FIE9 is high, and a raise command when it is low. is transmitted to the unmanned power plant 1 via the master station 11.

The command obtained by the slave station 8 through the transmission line 12 is given to the speed setter 7, and the speed governor control device 6 changes the speed of the water turbine 2. By changing the speed of water turbine 2, the system fc
9 is changed so that the automatic synchronizer 17 finds the synchronization point.

However, since this frequency adjustment command is manually executed using the selection control position, the operator needs to judge the length of the command operation time based on the magnitude of the frequency difference between the two systems. However, since the operating time of the frequency adjustment command received at the unmanned power plant 1 is cyclically transmitted via the transmission line 12, the data update and transmission time of cyclic transmission may be added to the time commanded by the operator. An error occurs in the frequency adjustment control command.

Furthermore, since the speed setting device 7 for changing the speed of the water turbine 2 is driven in proportion to the frequency adjustment command received at the unmanned power plant 1 described above, the frequency adjustment of the system 9 is finally carried out accurately. I won't be able to do it.

For this reason, frequency control to match the frequencies of both systems requires a very long time, and the control technology required of the operator also requires great skill.

In order to shorten the time it takes to restore the main grid, unmanned power plant 1 was used to conduct trial power transmission to distant places in automatic operation, but it took a long time to receive power to carry the load. Since it takes time, the total time until the final stage is completed becomes long.

[Purpose of the invention]

Therefore, an object of the present invention is to more reliably adjust the frequency of a water turbine generator operating independently when parallelizing the system with another healthy system after confirming the safety of the system through trial power transmission. It is an object of the present invention to provide a uniform speed control method that can be easily implemented, complete parallelization of systems in a short time, and shorten system restoration time.

[Summary of the invention]

In the present invention, when system parallelization with a healthy system is performed at a far away substation after a trial power transmission at the time of restoration of a system fault, frequency adjustment from a distant control center is proportional to the command operating time, that is, the width of the command pulse. In order to improve the above-mentioned problems caused by the method of controlling the rotational speed of the water turbine generator by The feature is that the rotation speed of the water turbine generator is controlled by the acceleration rate.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described using Sakai 1, FIG. 2, FIG. 3, and FIG. 4. FIG. 1 is a configuration diagram of a hydroelectric power plant when implementing the synchronous control of the present invention. Here, reference numeral 18 denotes a speed control auxiliary device that outputs an acceleration signal proportional to the number of pulses of the frequency adjustment command from the slave station 8 of the remote monitoring and control device to the speed governor control device 6 to perform synchronous speed adjustment. This speed control auxiliary device 18 is used only for frequency adjustment during trial power transmission operation, and is electrically excluded from the speed governor control device 6 during normal operation.

FIG. 2 shows the circuit configuration of the speed control auxiliary device 18.

25A (25B) is a part that receives the frequency adjustment command increase (lower) signal from slave station 8 of the remote monitoring and control device;
22A (22B) is a counting circuit that counts the number of pulses of an arbitrary width received from 25A (25B), and 23A (
23B) is a memory circuit that stores the value counted by the counting circuit 22A (22B), and 24A (24B) is the counting circuit 22A (22B) and the memory circuit 23A (23B).
26A (26B) A circuit that sequentially generates the raising (lowering) rate command for the memorized number of times under the control of B).
is a part that gives the rate command from 24A (24B) to the speed governor control device 6.

FIG. 3 is a time chart showing the functions of the speed control auxiliary device 18. Here, UCP (DCP) is the frequency adjustment control raising command (lowering command) pulse received at 25A (25B) in FIG. 2, fo is the reference frequency of the generator 3, A is the raising command (lowering command) ) Pulse U
Frequency change amount to be adjusted per CP (DCP),
t is the raising (lowering) rate command generation circuit 2 shown in FIG.
4A (24B), this is the period during which control is performed for each raising command (lowering command) pulse UCP (DCP).

FIG. 4 is a time chart of synchronous uniform speed control according to the present invention. 19 is the frequency of the system 9 where the water turbine generator 3 is charging;
20 is healthy system 140 frequency, 21 is system 9 and system 14
indicates the synchronization point.

In Figures 1, 2, 3, and 4, in order to restore system 9, which was completely shut down due to a system accident, the generator 3 of unmanned power plant 1 is used to confirm the normality of the system. , the terminal voltage of the generator 3 is gradually increased until it reaches the rated voltage at the end of the system 9, and the trial power transmission is completed. Thereafter, the healthy system 14 and the system 9 whose normality has been confirmed through test power transmission are connected in parallel.

First, the control center 10 obtains the frequency information of the healthy system 14, compares and judges the current frequency value of the system 9 that has completed the trial power transmission, and raises the frequency control command via the transmission line 12.
Or perform lowering control an appropriate number of times. In the present invention, the case where the frequency of the system Wc9 after trial power transmission is low will be described below as an example.

Pulse UCP of increasing frequency adjustment command from control center 10
The lowering command input unit 2 of the speed control auxiliary device 18 is transmitted n times at arbitrary intervals via the 8ft slave station of the remote monitoring and control device.
It is input to 5A.

The number of pulses of any interval and width received by the lowering command input section 25A of the speed control auxiliary device 18 is counted by the counting circuit 22A and simultaneously stored in the storage circuit 23A.

At the same time, a command output start signal is output to the circuit 24A that generates a frequency increase rate (A/11) command. The circuit 24A that generates the frequency increase rate command outputs a completion signal to the counting circuit 22A when one control is completed. Here, the counting circuit 24A subtracts 1 from the value of n times stored in the memory circuit 23A, and if the remaining number is not yet 0, the control is repeated sequentially. Of course, if a pulse command is input from the slave station 8 of the remote monitoring control device during rate control, it is counted by the random counting circuit 22A and stored in the storage circuit 23A.

The acceleration rate (A/ll) command for increasing the frequency is outputted from the 26A to the speed governor control device 6, so that the water single generator 3
is increased, and the frequency of system fc9 is increased at a constant rate (A/l
l).

As a result, the synchronization point 21 between the frequency 19 of the generator 3 and the healthy system M, 200 frequency 20 is passed. At this time, substation 1
In 3, the sound line 1 is input through the instrument transformer 16.
4 and synchronization point 21 of system 9, which has been restored from the accident, by automatic synchronization device 1.
7 and gives an automatic closing command to the system parallel breaker 15. When the power-on is completed, information on the system parallel breaker 15 is obtained at the control center 10, and the power-on information is stored. The stored information is given to the master station 11 as a selection command. Grid parallel breaker 1 installed in slave station 8 through transmission line 12
The information No. 5 is given from the slave station 8 to the speed control auxiliary device 18. The speed control auxiliary device 18 eliminates the uniform speed control that has been performed so far by confirming that the system parallel breaker 15 has been turned on.

Further, when the frequency of the grid 9 after the trial power transmission is high, the same control as above is performed using the lower side circuit.

[Results of invention]

When implementing system parallel operation as described above, frequency control for an unmanned power plant, which used to be left to the operator's judgment, can be performed by simply giving an arbitrary frequency control command an arbitrary number of times.

In other words, with the speed control device of the present invention, the speed control device of the present invention can perform control that required a long time in parallel to the system due to the conventional selection control in which the magnitude of the command was changed depending on the operating time and the transmission time delay due to the transmission line. By increasing or decreasing the frequency control amount per command at a constant rate, system parallelization can be accurately completed in a short time. This also simplifies the operations performed by the operator and reduces the burden on the operator.

Even when trial power transmission is carried out using a plurality of devices, it is possible to handle the situation by using the synchronous speed equalization control device of the present invention.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a hydroelectric power plant to explain an embodiment of the present invention, Fig. 2 is a circuit block diagram of the speed control auxiliary device [8], and Fig. 3 is a timing diagram showing the operation of the speed control auxiliary device. FIG. 4 is a time chart showing its characteristics, and FIG. 5 is a block diagram of a hydroelectric power plant to explain a conventional example. 1... Power plant 2... Water turbine 3... Water turbine generator 4... Main transformer 5... Parallel breaker 6... Speed governor control device 7... Speed adjustment setting device
8 ・Remote monitoring control device 9...Power transmission line
10...Control center 12...Transmission line 13...
Substation 14... System 15... Breaker 16... Instrument transformer 17... Automatic synchronizer 18... Speed control auxiliary device Agent Patent attorney Noriyuki Chika Yudo Hiroshi Mimata 1st Figure 5

Claims (1)

[Claims] At a hydroelectric power station that is controlled from a remote control center and conducts test transmission, when parallelizing the system with a healthy system at a far away substation after the test transmission at the time of system failure recovery, arbitrary Synchronous alignment characterized by comprising means for counting frequency control commands by pulses of width, and means for generating a signal for controlling a water turbine generator by a constant amount and constant acceleration based on the counted value. speed control device.